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Does
spark stop
when pilot
lights?
24 volts
across
terminals 2&3
at S8670?
Spark
across
ignitor/sensor
gap?
Y
Can you
hear
sparking?
* Defective
S8670
module
* Break in
spark cable
insulation
* Break in pilot
porcelain
* Incorrect
pilot spark gap
* Loose
connection in
spark cable
* Loose
ground
connection
N
Pilot
lights?
Y
NN
* Defective
S8670 module
24 volts
across PV &
MV/PV at gas
va l ve?
* Defective EI
wiring
harness.
N
* Loose connection
in ignition cable or
ground wire
* Pilot electrode
porcelain cracked
* Pilot flame not
covering gap
between electrode
and grounding
strap
* Low gas pressure
at gas valve inlet
* Defective S8670
module
Main
burner
lights?
N
Y
24VAC
across
terminals 1&2
on S8670?
Y
N
N
* Defective
S8670
module
24 volts
between MV &
MV/PV on gas
va l ve ?
* Defective
gas valve
*Defective EI
harness
END
START
(24 volts is present across 5 and 6 on S8670, 30-50
second prepurge period has passed, but main
burners do not light)
N
Y
Y
N
Y
Y
Y
* Low line pressure
* Plugged, kinked or leaking
pilot tubing
* Plugged pilot orifice
* Gas line not purged of air
* Defective pilot assembly
* Defective gas valve
Intermittent Ignition System Troubleshooting Chart